The operation took about 20 hours, according to Seoul, after the man was detected by a military surveillance device sometime between 3am and 4am local time.
The mission to safely guide him to the South involved a considerable number of South Korean troops, the JCS said, and took place in an area difficult to navigate due to dense vegetation and landmine risks.
The man stayed mostly still during the day, and South Korea’s military approached him at night.
He willingly followed the troops after they offered to guide him safely out of the DMZ, according to the JCS.
It said “relevant authorities” will investigate the detailed circumstances of the incident.
North Koreans are typically handed over to Seoul’s intelligence agency for screening when they arrive in the South.
The incident comes after a North Korean soldier defected to the South by crossing the MDL last August.
Also last year, another North Korean defected to the South across the de facto border in the Yellow Sea, arriving on Gyodong Island off the peninsula’s west coast near the border between the Koreas.
Tens of thousands of North Koreans have fled to South Korea since the peninsula was divided by war in the 1950s, with most going overland to neighbouring China first, then entering a third country such as Thailand before finally making it to the South.
Defections across the land border that divides the peninsula are relatively rare.
The number of successful escapes dropped significantly from 2020 after the North sealed its borders - purportedly with shoot-on-sight orders along the land frontier with China - to prevent the spread of Covid-19.
No unusual activities by the North Korean military have been detected, the JCS said today.
South Korea’s President Lee Jae Myung, who took office last month, has vowed a more dovish approach towards Pyongyang compared with his hawkish predecessor Yoon Suk Yeol.
“Politics and diplomacy must be handled without emotion and approached with reason and logic,” Lee said yesterday.
“Completely cutting off dialogue is really a foolish thing to do.”
-Agence France-Presse